thaumetopoea pinivora, the eastern pine processionary walking on bark of pine tree

animal bark black branch bug butterfly caterpillar closeup damage danger dangerous dead eastern environment foliage forest hair hairy health infected infection infestation insect invertebrate larva larvae leaf lepidoptera macro mediterranean moth natural nature needle nest parasite pest pine pinivora pityocampa plague poisonous procession processionary silk spring tent thaumetopoea tree walking wildlife worm